NHL repeat domain of the tripartite motif-containing protein 71 (TRIM71) and related proteins
The E3 ubiquitin-protein ligase TRIM71 (LIN-41) is a RING-finger domain containing protein that has been associated with a variety of activities. The NHL repeat domain appears responsible for targeting TRIM71 to mRNAs, and TRIM71 appears responsible for translational repression and mRNA decay. Together with BRAT, TRIM71 may be part of a family of mRNA repressors that regulate proliferation and differentiation. TRIM has been shown to negatively regulate stability of Lin28B, which inhibits the pre-let-7 miRNA precursor from maturing by recruiting the terminal uriyltransferase TUT4. This family also contains the Caenorhabditis elegans NHL repeat containing 1 (NHL-1), a RING-finger-containing protein that was shown to interact with E2 ubiquitin conjugating enzymes in two-hybrid screens. Its domain architecture resembles that of the E3 ubiquitin protein ligases TRIM2, TRIM32, and TRIM71. The NHL (NCL-1, HT2A and LIN-41) repeat is found in multiple tandem copies, typically as 6 instances. It is about 40 residues long and resembles the WD repeat and other beta-propeller structures.
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